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Studies on the Preparation and Performance of Ni-SiO2 Nanocomposite Coatings Prepared by Pulse Electroplating Technology

Author: ShiJun
Tutor: ZhangWeiGuo
School: Tianjin University
Course: Applied Chemistry
Keywords: Ni-SiO2 composite coating Electrodeposition Hardness Wear
CLC: TQ153
Type: Master's thesis
Year: 2009
Downloads: 38
Quote: 0
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Abstract


In this thesis, unidirectional pulsed electrodeposition processes to brass sheet as the substrate, prepared Ni-SiO2 nano- composite coatings were investigated pulsed electrodeposition bath composition and process parameters on the Ni-SiO2 composite coating performance, determine the Ni-SiO2 Nanocomposite Coatings optimal preparation . Combined with energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM) and X- ray diffraction (XRD) and other testing techniques , the coating composition, structure , morphology , hardness and wear resistance were studied, and the preliminary study way of deposition coating performance. By changing the bath concentration of SiO2 nanoparticles , the coating can be adjusted the content of SiO2 nanoparticles , thus affecting the Ni-SiO2 Nanocomposite Coatings ; bath by adding an appropriate amount of additives can enhance the ability of SiO2 nanoparticles dispersed , the coating crystallization more detailed ; bath pH and temperature on the electro-deposition rate significantly affect its value is too high will cause the coating structure loose, too low will lead to deterioration of the bath ; addition , the pulse duty cycle and the average current density of the composite pulse frequency are also the corrosion resistance of the coating composition and a significant impact . Experimental results show that , Ni-SiO2 Nanocomposite Coatings optimum process parameters are: the bath concentration of SiO2 nanoparticles 10g · L-1, additive concentration was 20mg · L-1, pH 4.4 to 5.2 , the bath temperature at 50-60 ℃, pulse frequency is 0.6 kHz, the duty cycle is 0.6 , the average current density of the pulse 1A · dm-2. Thesis prepared under different conditions Ni-SiO2 Nanocomposite Coatings structure , hardness and wear resistance were tested , research shows that the coating of the content of SiO2 nanoparticles on the coating hardness and wear resistance significantly affected : pure nickel plating amount of wear coating 18.68mg, while Ni-SiO2 Nanocomposite Coatings wear up to 11.68mg; Ni-SiO2 nano- composite coating along the ( 111 ) crystal plane preferred orientation occurs , with the composite coating SiO2 content increases , the coating in the ( 220 ) plane diffraction peak of the relative intensity gradually increases. Unidirectional pulsed electrodeposition of Ni-SiO2 prepared nanocomposite coatings deposited with DC outperforms the composite coating performance.

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